/*
 * Copyright 2017-2018 Allegro.pl
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { ROW_HEIGHT } from "../dimensions";

export function visibleIndexRange(rowCount: number, height: number, scrollTopOffset: number): [number, number] {
  return [
    Math.max(0, Math.floor(scrollTopOffset / ROW_HEIGHT)),
    Math.min(rowCount, Math.ceil((scrollTopOffset + height) / ROW_HEIGHT))
  ];
}
